Steam boiler



July 7, 1925. 1,545,161

' A. NAULT STEAM BOILER Filed Octe 25 1922 3 Sheets-Sheet 1 July 7, 1925. 1,545,161

A. NAULT STEAM BOILER Filed Oct. 25, 1922 3 Sheets-Sheet 2 Queen-Tow attorney A. NAULT STEAM BOILER July 7, 1925. 1,545,161

- Filed Oct. 25, 1922 3 Sheets-$heet 5 wr'clzie Nauli made, 1 W

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ARCHI NAUL'T, or PORTLAND, OREGON.

BOILER.

imi ation filed oc'tober 25; 1922. Serial No. 596,879.

T aZZ wYwW t may concern; a "Be it known that I, AROHlE NAULT, a citi- Zen of the .Uriited1 States of lirmerica, and

resident of the city of Portland, in Multno- 'mah County,- State of Oregon, have invented certain new and useful Improvements in SteamBoil-ers,,of which the following is a specification. I

My invention relates to steam. boilers and particularly to an internally fired type of steam boilers iprovidedwith a peculiar arrangement of both water and smoke fiues.

Qneobjectof my invention is to provide atypeof boiler construction in which greaterfecononiy in theuse of fuel may be had by extracting therefrom. a larger percentage of the heat units developed by burning, and one which shall be coinpact'in shape, of a type of constructionwhich is readily manufactured and to. which repairs may be readily ,q The features of my inyention whichl believe to; be new and upon which I deslre to secure a patentwill be hereinafter described 25.

and then particularly defined by the claims. In the accompanying drawings I have shown .myinvention embodied in a type of construction which Ipreter to use.-

Figure- 1 is a transverse section taken substantially upon the plane indicated by the 1bro n' ie I i 1 Figure 2 is longitudinal section taken on {vertical plane passing through thecenter line oi the boiler. i V

f F gul'e als an outer end Viewof the boiler with the outer; cas ngof one smoke chamber 1n section, v

Figure 4 is a windowin the manner of erting and securing certain of the fiues 1n the boiler.

{The boiler illusthated in the drawings has an inner andouter shell forming between them water containing spaces, which spaces extend over they head of the inner shell as well as aboiut its periphery.' These water spaces extend downward at the under side i of the boiler to form a water leg as 1-0 in which is placedthe grate 11. At one end of the furnace chamber thus provided; a suitablefire door or doors 12 are provided.

The innershell 1 above referred to and ithetouter shell Q a-re preferably made concentric with each. other, the nner shell be ing cnoughshorter than. the outer shell to form a suitable water" space as 12 between the two heads at. each end of the boiler. The

of the circle of the boiler.

shell 2 which I have above referred to as the outer shell, is in reality an intermediate shell, ifthe shell 3 which encloses the smoke passages is considered. This last, which is the outermost shell forms a smoke passage 30 extending about the periphery of the shell 2 and has its heads 31 and 32 spaced away from the heads of the shell 2 a sufficient distance to form smoke fiues. One of these heads is connected with a stack flue 33 from which the products of combustion are con- Veyedaway from the boiler.

Centrally positioned within'the inner shell 1 is a water drum 4 which drum extends from head to head of the inner shell. EX-

tending in a general radial direction from this drum 4 to the periphery of the inner shell 1, are a series of fiues or pipes 40 which form water connection between the interior of the drum 4 and the water space 20 between the inner and next outer or intermediate shell 2. Thesevradially positioned fiues 40 are spaced at intervals in the upper half They are arranged in rows which extend lengthwise of theaxis of the boiler. In one of the lower quarters of the boiler a bafl'le wall 42 is provided which extends across the space hetween the drum 4 and the inner shell 1. This causes the gases of combustion to be deflected to the other side of the boiler and to pass in a circular path about the. central drum 4.

drum 4 pass through the fiues 43 into the smoke chamber 30 and thence pass about the periphery of the boiler between the two shells ,2 and 3. until the opposite end of the chamber .30 is reached. At this point a port or opening 34 is left in one of the partitions 35 which separates the peripheral section of the smoke chamber, represented by the passage 30, from the chambers 36 and 37 which lie between the head of the intermediate shell land the outermost shell 31 and 32. The gases of combustion pass into the cham-- ber 37 which is at the forward head of the boiler. v, v

The heads 22 of the intermediate shell. being the outer head of the boiler proper, are

.Just above'the bafile wall 42 are a series of site ends of the boiler.

provided with openings for the reception of fines which extend from head to head. Of these fiues a certain number, 5, located so as to pass through the central drum 4, are secured directly into the heads 21 at oppo- These form fluesfor the passage of the hot gases from the chamber 37 at one end of the boiler to the corresponding chamber 36 at the other end. From thence they pass into the uptake or stack 38. There are similar fines 41 which connect the heads of the inner shell and which lie within the segments between the radial flues 40.

The heads 220i the intermediate shell are provided with openings alined with the fines ll and of a size to permit passage of these fines so that the same may be removed, inserted, and other repair work be conven iently done thereon. The holes in the heads22 are closed by'means of a cup-like member 6 which is made of metal and has a shallow cup, this being of a size to fit snugly in the hole in the head 22. It is secured in place by rolling, after the manner in which boiler fines are secured in the heads. This i clearly indicated in Figure 4.

1 In connection with the fines 41 which contain water, I prefer to employ smaller smoke lines as which have their ends similarly secured in the bottom of the cup member 6 by beingrolled in holes centrally formed therein, as is clearly indicated in Figure 4. These pass concentrically through the water containing flues ll and connect the heads 22 of the intermediate shell 2. These form additional passages forthe passage of gases of combustion between the two head chambers 36 and 37. If at any time it is necessary to repair either of the tubes ll or 60, the cup member 6 may be removed along with one of the inner lines 60. The other flue 41 may then be similarly removed, following the method of procedure adopted in removing boiler flues. V I mayialso provide fire tubes 61 connecting the heads of the outer boiler shell 2 and extending through the annular water-holding space between inner and outer boiler shells l and 2.

It will be noted that all parts of the above boiler are strengthened against strains in every direction. It is alsopossible to get at the fines and tubes employed to remove or repair them. 7 The outer shell or jacket 3 which encloses the gas flues, may be readily removed for access to the shell of the boiler proper. In consequence of the large surfaces which are exposed to the action of the gases the evaporation per unit of fuel will be large. The boiler will therefore be economical in operation. It is also compact and welladapted for any purpose such, for instance, asmarine' work, where capacity and'cconomy of space are important items.

While the boiler herein described has been referred to as a steam boiler it is evident that it may be employed as a. boiler for hot water heating systems.

What I claim asmy invention is:

1. A boiler comprising two concentric shells differing in length and each including a cylindrical major part having depending sides and heads connected at their lower edges to form water legs and an enclosed furnace chamber, a centrally placed water drum connecting the heads of the inner shell, radially positioned water pipes extending between the cylindrical portions of said drum and the inner shell and connecting the interior of said drum with the water space between the two shells, a baflle extending between the drum and the first shell over one side of the furnace chamber and smoke fines connecting the two shells closely above said bafile.

2. A boiler comprising two concentric shells diflering in length and each including cylindrical major part having depending sides and heads connected at their lower edges to form water legs and an enclosed furnace chamber, a centrall placed water drum connecting the heads 0 the inner shell,

radially positioned water pipes extend-ing between the cylindrical portions of drum and the inner shell and connecting the interior of said drum with the water space between the twoshells a bafiie extending be tween the drum and the first shell over one side of the furnace chamber, smoke flues connecting the two shells closely above said baflie, an outer casing forming smoke boxes at each end of the boiler and a chamber extendin peripherally .over the cylindrical part 0% the boiler, one of saidsmoke boxes being connected with said ripherally extending chamber at one en of the latter,-a stack connected with the other smoke box and smoke flues extending between opposite heads of the outer boiler shell. 3. A boiler having inner and outer cylindrical shells and heads therefor formin an annular water space between them an extending between their heads, a centrall placed water drum connecting the headz of the inner of said shells, smoke flues passing through said water drum and connecting the heads of the outer of said shells, a

third and outermost shell enclosing the two first named shells and spacedtherefrom to form smoke passages about their peri hery and over their heads, partitions dividing said smoke passages at the outer ps- .riphery of the boiler heads-one of said partitions having a communicating opening in the lower quarter thereof, a. bame connecting theinner shell with .the central water drum on the opposite lowerquarter, smoke fiues just above said bafiie extending through the water space between the two inner shells, smoke flues connecting opposite heads of the outer boiler shell and extending through the inner shell outwardly of the central drum, and a discharge connection With the smoke chamber at the end opposite that which is connected with the peripheral smoke passage.

4:. A boiler having an inner and an outer shell and heads therefor forming an annular Water chamber and communicating chambers extending over the heads, and a third shell enclosing the boiler shells and forming smoke passages enveloping the first named shells, the head and peripheral portions of said smoke passages being sep arated by partitions one of which has a flue opennig at one lower quarter of the boiler, smoke fiues connecting the peripheral smoke passage through the Water cham- 20 her with the interior of the inner shell in the lower quarter opposite to that containing the said flue opening, a central water drum connecting the heads of the inner drum, a baffle extending across the combustion chamber lying between said drum and the inner boiler shell and located just below the smoke fines which connect said combustion chamber with the peripheral smoke chamber, smoke fiues connecting the heads of the outer boiler shell through the central water drum, radially extending pipes connecting said central drum with the periphery of the inner shell across the combustion chamber, and water tubes connecting the heads of the inner shell and extending through said combustion chamber between said radial flues.

Signed at Portland, Multnomah County, Oregon, this 14th day of October 1922.

ARCHIE NAULT. 

